at the place i work at we pretty much only weld aluminum, and some of the peices i work on are upwards of 1500 pounds, 100% x-ray and dye checked, we do have beeswax, and that works ok if you don't have to weld on it or you then buff it off with a scotch pad, but we have this silicone lube that works really really well, and leave almost no residue, with the little amount that would be on the blade/pad, most of the residue would be on the shavings. the stuff we use is in a green can, made by scjohnson wax i think, but i'm sure any silicone would work and when your using it you can feel the difference in the cut. i've been using alot of the same cutting tools since i started there, (almost 2 yrs) that stuff can make an old tool new again,
but be careful to keep it away from an open flame (the can) it is really flamable and the gasses the propelent gives off when its burning apparentely is toxic...
later